um CHILL 125 cc. Service Manual page 25

 The Positive and Negative of the battery cannot be reversed. It may damage the EFI components.
 Is forbidden to remove the battery when the engine is running.
3. Tools
 Multimeter: Measure the voltage, the resistance and the harness connection.
 Diagnostic tool: reading the malfunction code, and engine parameters.
 Oil pressure gauge: Measure the fuel pressure.
 Cylinder pressure, Measure the cylinder pressure.
4. Maintenance depending on the malfunction code.
Description
 If the issuer cannot repeat, the issuer analysis may be wrong.
 The multimeter below means the digital type. Pointer-type is forbidden.
 If the malfunction code shows the voltage is low, it means maybe the wire is short to ground. If the malfunction code shows the voltage is high, it means maybe
the wire is short to battery. If the malfunction code shows the components signal abnormal, it means the wire is open or short to other wires.
CHILL 125 cc. SERVICE MANUAL AND EFI DIAGNOSTIC
25